What is the format for an absolute file address for the style file 'include' directive under Windows?

The form "C:\Users\Roger\Documents\maps\styles\includes\roger_lines" fails, as does "C:/Users/Roger/Documents/maps/styles/includes/roger_lines".

I have no problem with relative addresses - "../includes/roger_lines" works as expected.

Many thanks,

Roger
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Roger Calvert
http://www.rogercalvert.me.uk